Author's note: I've got a few chapters already written, so this won't be a drawn out story. I just thought 500 words for a first chapter was rather short, so I'm uploading this today as well.
Albus received a few 'hello's from his students as he walked through the hallways and smiled in return, turning up the twinkle. Every so often he had to get out of his office no matter how much he loved the room, to stretch his legs a bit and reassure the students that he was still alive and kicking, as it were. Make an appearance, have a change of pace, and other such sentiments. He walked with purpose but not with haste, gazing about with an air of happy contemplation. He found it was the easiest way to put people at ease. He also approved of the regal way his plum robes swept over the flagstones, which put him in a happy mood on any day.
It was time for a class change, and the hallways were bustling with activity. Dumbledore was on his way to Minerva's classroom to give her the news during her free second period, and perhaps have a spot of tea.
"Hi Al-Bledore!" He heard Harry call as he rounded the corner and dashed out of sight. Hmm. I've never heard that particular nickname before. And actually, Harry has never called me by a nickname. He thought, putting a finger to his bearded chin. He was distracted as Minerva's door opened at the end of the hall and the professor herself stepped out.
"Ah, Minerva, just who I was looking for!" Albus said happily, walking up to her as she locked her classroom up. "I have some good news!"
"Can't it wait, Albus? I'm frightfully busy," She said without making eye contact as she shuffled a few things around in her arms.
"It can, but only if you are willing to miss the Order meeting tonight," he said teasingly, hoping to pique her interest. He thought baiting Minerva was strange, but it took him a moment to figure out why he thought so. I usually don't have to try for her attention, he realized. Occasionally, his audience felt the need to examine a thought in depth during a conversation, a scholarly habit which Dumbledore appreciated, but which caused him to have to regain their attention occasionally. But Albus knew that the transfiguration teacher admired him past what a work relationship normally suggested; he usually didn't have to try for her attention because she usually gave it to him. Strange, he thought.
"Excuse me?" She said, momentarily stopping her juggling to look up at him.
"The first Order meeting is set for tonight at eight o'clock, in the newly restored Number 12 Grimmauld place!" he said with a flourish.
"I'll be sure to be there then. Goodbye, Albus," Minerva said, and walked briskly away, leaving him smiling expectantly at the empty airspace in front of him. Very strange indeed. His contemplation of the strange conversation was broken when a student walked past him and gave him a slightly uneasy look. Dumbledore took stock of his appearance, wiped the frozen smile off his face, and spun around towards the direction of his office and began walking. He'd had enough change of pace for today.